The V8Js class

(PECL v8js >= 0.1.0)

简介

This is the core class for V8Js extension. Each instance created from this class has own context in which all JavaScript is compiled and executed.

See V8Js::__construct() for more information.

类摘要

V8Js {
/* Constants */
const string V8_VERSION ;
const int FLAG_NONE = 1 ;
const int FLAG_FORCE_ARRAY = 2 ;
/* Methods */
public __construct ( string $object_name = "PHP" , array $variables = array() , array $extensions = array() , bool $report_uncaught_exceptions = true )
public executeString ( string $script , string $identifier = "V8Js::executeString()" , int $flags = V8Js::FLAG_NONE ) : mixed
public static getExtensions ( ) : array
public getPendingException ( ) : V8JsException
public static registerExtension ( string $extension_name , string $script , array $dependencies = array() , bool $auto_enable = false ) : bool
}

预定义常量

V8Js::V8_VERSION

The V8 Javascript Engine version.

V8Js::FLAG_NONE

No flags.

V8Js::FLAG_FORCE_ARRAY

Forces all JS objects to be associative arrays in PHP.

Table of Contents

User Contributed Notes

stamster at gmail dot com 25-Jan-2017 03:28
Take note that just instantiating V8 class / binary .so will add at least 5ms to your app/script runtime.

Test from LAN (minimum network latency):

PHP 7.0.x w/o instantiating V8JS class: 1ms
PHP 7.0.x with V8JS object: 6-7ms

Running V8 engine v5.8.0

It's not a big deal, but comparing to PhalconPHP framework which adds almost 0 additional latency at runtime, V8JS adds 5-6 times more of latency/overhead.
Hoffmann dot P-no-sp at m-gmx dot net 13-Dec-2016 10:52
You can use function variables (jay!)

So the following works:

$add = function ($a, $b) {
    return $a + $b;
};
$v8 = new V8Js('PHP', array('add' => 'add'));
$result = $v8->executeString('PHP.add(1,2)');
var_dump($result);

yields indeed:
int(3)
mateusz dot charytoniuk at gmail dot com 18-Aug-2015 08:58
v8js can be also used to render server-side javascript components (see: React.js).
mateusz dot charytoniuk at gmail dot com 11-Jul-2013 09:41
This extension can be used to provide server-side and client-side form validation by executing the same JavaScript code at both places.